Prostate & pelvic cancers
Tight dose shaping keeps bladder and rectal dose low across a full course of prostate, gynaecological or pelvic radiotherapy.
Treatments
IMRT & VMAT sculpt the dose
IMRT & VMAT sculpt the dose
in three dimensions.
Intensity Modulated Radiation Therapy (IMRT) shapes radiation beams to closely match the tumour — and varies the beam's intensity across the field, sparing more healthy tissue than conventional radiotherapy while allowing a higher dose to the tumour. VMAT delivers the same modulation in efficient arcs around you.
3DSculpted dose distribution
MLCMultileaf collimators shape every beam
10–15minTypical session, most of it positioning
Image · placeholderMultileaf collimator leaves shaping a modulated field
Image · placeholderPlanning view — colour-washed dose wrapping the target
IMRT / VMAT · What it is
Intensity modulation, in plain language.
IMRT is a form of conformal radiation: the beams are shaped to closely approximate the tumour's outline. What sets it apart is modulation — the intensity of the radiation is varied across each beam during treatment, using multileaf collimators (MLCs) whose leaves move in and out of the beam's path as it's delivered.
A combination of these varying-intensity beams produces a highly sculpted three-dimensional dose distribution: maximum dose to the tumour, while reducing — or even avoiding — the healthy tissue beside it. Advanced computer planning finds the best combination of beams to achieve exactly that.
Because normal tissue is spared, a higher dose can safely be delivered to the tumour than conventional techniques allow. VMAT (Volumetric Modulated Arc Therapy) is the modern evolution: the machine delivers the modulated dose while rotating around you in continuous arcs, cutting treatment time substantially.
IMRT / VMAT · Who is it for
Cancers and situations where IMRT / VMAT can help.
IMRT is used most extensively for cancers where dose needs to wrap tightly around critical structures.
Head & neck cancers
Sculpting dose around salivary glands, swallowing muscles and the spinal cord — protecting voice, taste and swallowing.
GI, CNS, sarcoma & paediatric cancers
Gastrointestinal and central nervous system tumours, sarcomas, and selected paediatric cases where sparing growing tissue matters most.
IMRT / VMAT · How it works
Shaped, modulated, verified.
Your radiation oncologist determines suitability based on the tumour's position, your age and health — then the planning discipline takes over.
Image · placeholderContouring on the planning workstation
Planning CT & contouring
A scan in the treatment position; your oncologist contours the tumour and every organ-at-risk slice by slice.
Image · placeholderOptimisation view — modulated beam patterns
Inverse planning
The computer works backwards from the dose goals, calculating the MLC leaf patterns and beam intensities that achieve them.
Image · placeholderPhysicist running plan quality assurance
Physics verification
The plan is independently checked and measured on the machine before your first session.
Image · placeholderVMAT arc delivery around the patient
Daily image-guided delivery
Each session: position, verify with imaging, treat. The MLC leaves dance through their pattern as the beam (or arc) delivers.
IMRT / VMAT · What to expect
Short daily sessions, normal life between.
Treatment is outpatient, typically daily on weekdays over several weeks depending on your prescription. Each session takes 10–15 minutes, most of it careful positioning; the beam itself is silent and painless.
Because side effects are reduced compared with conventional radiation, most patients continue working, driving and living normally through the course, resuming full activities earlier after it ends.
Site-specific effects — skin changes, fatigue, or irritation of nearby organs — are monitored at weekly reviews and managed as they arise.
Image · placeholderPatient walking into the treatment room for a daily session
IMRT / VMAT · Cost & insurance
Is IMRT / VMAT covered?
IMRT and VMAT are claimable under Medisave and MediShield Life for approved indications, and covered by major Integrated Shield Plans.
We provide a written cost estimate at consultation, before any treatment begins. Our care coordinator can verify your coverage with your insurer in advance.
Image · placeholderAARO specialists at the Centre for Stereotactic Radiosurgery
IMRT / VMAT · Your specialists
Meet Dr Jonathan Teh→
Who delivers IMRT/VMAT at AARO.
Every AARO radiation oncologist is trained in the full spectrum of modern modulated techniques — your consultant chooses IMRT or VMAT when it's the right fit for your case, supported by the physics team that verifies every plan.
Dr Daniel TanSRS · SBRT · Brain · Spine · Prostate
Dr Jonathan TehGU · Head & Neck · GI · Sarcoma · Paediatric
Dr David TanGynae · GI · Hepatobiliary · Lung
Dr Michelle TsengBreast · Gynae · Paediatric
Not sure which radiation technique fits your case?
Book a consultation. We'll review your imaging and recommend the technique that fully achieves the treatment goal — and explain why.